17.64 Use Problems
Condition: On a weekday, cars make up 70 \% of urban transport. On a weekend, a certain number of "cars" leaves the city, the rest make up 60 \% of the transport remaining in the city (only cars travel around the city). What part of all city transport goes to nature?
Problems of the Use (Unified state Exam) - Equations and Inequalites in Terms of A Parameter, Solved Both by Algebraic Methods and Geometric One.